60cm of meteorite should weight enough to make a good-sized crater at its landing site, even with Mars' weaker gravity. Where is the crater? The above photo shows the supposed meteorite standing in perfectly smooth terrain...

The atmosphere on mars is a lot less dense than on earth and it could be millions of years old. It could have bounced/rolled into its current position (meteorites don't always go vertically) and or sandstorms (common on mars) could hide the impact scars. Or one of the many other possibilities is that the crater is larger and only visible from high above.